Final answer:
The power of the motor is found by dividing the work done (5,000 Joules) by the time taken (20 seconds), which results in a power output of 250 watts (W).
Step-by-step explanation:
The power of a motor is calculated by the formula P = W/t, where P is the power, W is the work done, and t is the time taken. In this case, the motor does 5,000 Joules of work in 20 seconds. Using the formula, we can calculate the motor's power:
P = 5000 J / 20 s = 250 W
Therefore, the power of the motor is 250 watts (W).